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Operating Systems Solaris Special symbols in shell scripting Post 302277929 by Ariean on Sunday 18th of January 2009 10:30:57 PM
Old 01-18-2009
Special symbols in shell scripting

I am new to unix shell scripting, i was going through the existing shell scripts but couldn't able to get enough information on below syntaxes,i mean the symbols $# & $? used in the if loop. what exactly are they? what is the inline meaning, Could you please throw some light.

Examples:

1)
if [ $# -eq 3 ]
then
numFiles=`cat $3 | wc -l | sed 's/ //g'`
#echo $numFiles
count=0

2) if [ $? -eq 0 ]
then
echo "File $line moved to archive on `date +%D`">>$logFile
#echo $'\n' >>$logFile
else
echo "File $line can not be deleted">>$logFile
fi
 

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SHTOOL-ECHO.TMP(1)					      GNU Portable Shell Tool						SHTOOL-ECHO.TMP(1)

NAME
shtool-echo - GNU shtool echo(1) extensional command SYNOPSIS
shtool echo [-n|--newline] [-e|--expand] string DESCRIPTION
shtool echo is an echo(1) style command which prints string to stdout and optionally provides special expansion constructs (terminal bold mode, environment details, date, etc) and newline control. The trick of this command is that it provides a portable -n option and hides the gory details needed to find out the environment details under option -e. OPTIONS
The following command line options are available. -n, --newline By default, output is written to stdout followed by a "newline" (ASCII character 0x0a). If option -n is used, this newline character is omitted. -e, --expand If option -e is used, string can contain special "%x" constructs which are expanded before the output is written. Currently the following constructs are recognized: %B switch terminal mode to bold display mode. %b switch terminal mode back to normal display mode. %u the current user name. %U the current user id (numerical). %g the current group name. %G the current group id (numerical). %h the current hostname (without any domain extension). %d the current domain name. %D the current day of the month. %M the current month (numerical). %m the current month name. %Y the current year. EXAMPLE
# shell script shtool echo -n -e "Enter your name [%B%u%b]: "; read name shtool echo -e "Your Email address might be %u@%h%d" shtool echo -e "The current date is %D-%m-%Y" HISTORY
The GNU shtool echo command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 1998 for Website META Language (WML) under the name buildinfo. It was later taken over into GNU shtool. SEE ALSO
shtool(1), echo(1). 18-Jul-2008 shtool 2.0.8 SHTOOL-ECHO.TMP(1)
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